Locking-nut and bolt.



r a. w. POPFINBARGBR.

LOOKING NUT Am) BOLT; rruonmi nun nov. 2a, 1900.

Patented Aug. 31, 1999.

NITED STATES PATENT FFTGE.

GEORGE W. POFFINBARGER, 0F WINTERSERIOWA, ASSIGNOR 0F ONE-THIRD T0 F. H.MCKIN- ZIE, OF WINTERSET,:IOWA;

LOCKING-NUT AND BOLT.

Specification of Letters Patent.

PatentedAug. e1, 1909.

To all whom it may concern:

Be it known that I, GEORGE W. PoEEIN-' BARGER, citizen of theUnited-States, residing at VVinterset, in the county of Madison andState of Iowa, have invented a new and useful Locking-Nut and Bolt, ofwhich the following is a specification.

The object of this invention is to provide improved means for locking anut on a bolt.

A further object of this invention is to provide animproved'construction for alocking nut.

My invention consists in the construction, arrangement and combinationof elements hereinafter set forth, pointed out in my claims andillustrated by the accompanying drawings, in which Figure l is a sideelevation of a bolt and two nuts mounted thereon. Fig. 2 is a similarview showing the nuts in diametrical section. Fig. 3 is an end elevationof the devices shown in Fig. 1. Fig. 4 is a diametrical section of thelocking nut. Fig. 5 is a diametrical section of a locking nut involvingthe same improvement but of cap form. Figs. 6 and 7 are end views ofnuts of slightly modified form.

In the construction of the device as shown in Figs. 1, 2, 3 and 4, thenumeral 10 desig: nates a bolt formed with a thread 11 of any desiredpitch and a continuous direction. A nut 12 of common form is providedwith an interior thread mating the thread 11. A locking nut 13 isprovided and is formed with an interior thread 14 of the same pitch butopposite direction relative to the thread on the interior of the nut 12.The locking nut 13 also is formed with a plurality of grooves 15parallel with its axis and opening to the interior opening or bolt holeof the nut and intersecting or traversing the thread 14. The locking nut13 also is formed with a countersink 16 at one end of the opening orbolt hole therein.

The grooves 15 may be square in crosssection as shown in Fig. 3, or theymay be curved or V-shaped as shown in Figs. 6 and 7, or of any desiredshape. It is the function of the grooves 15 to bisect or out thecontinuity of the thread 14 and thethreaded portion of the lockin'g'nutis hardenedsome what relatively to the remainder'of the-nut. Thus thelocking nut 13 partakes of the characteristics of a thread-cutting dieand the counter sink 16 in one end thereof prevents cutting of thethreads across entirely to the outer end of the nut 12.

The locking nut may be made of cap form 13, as shown in Fig. 5, and beprovided with the bolt hole, the grooves 15 opening thereinto, thethread 14 in the bolt hole and the countersink 16 at the open end of thebolt hole.

In practical use the nut 12 is screwed on the bolt 10 in the directionof the thread 11 to the desired extent. Then the locking nut 13 isscrewed by hand on the bolt 10 in the direction of the thread 14, whichis opposite to the direction of the thread 11, and the thread 14 startsbecause of the grooves 15 spanning the thread 11 and cuts across thethread 11 and seats the locking nut in contact with the nut 12.

Any desired shape or configuration may be given to the outer end of thenut 13 I claim as my invention 1. A locking nut and bolt, comprising abolt formed with a single. thread, a nut mating with and adapted to bescrewed on the thread of said bolt, and a locking nut formed with athread opposite to the thread of the bolt and also formed with groovesparallel with its axis and crossing the thread thereof.

2. A locking nut and bolt, comprising a bolt formed with a singlethread, a nut mating with and adapted to be screwed on the thread ofsaid bolt, and a locking nut formed with a thread opposite to the threadof the bolt and also formed with a countersink at one end of the bolthole therein.

3. A locking nut and bolt, comprising a bolt formed with a singlethread, a nut mating with and adapted to be screwed on the thread ofsaid bolt, and a locking nut formed with a thread opposite to the threadof the bolt, and also formed with grooves bisecting said thread, andalso formed with a countersink at one end of the bolt hole therein, saidlocking nut adapted to be oppositely screwed on the bolt.

GEORGE WV. POFFINBARGER.

Witnesses:

S. C. SWEET, F. H. MGKINZIE.

